<!--
 * @Author: your name
 * @Date: 2021-08-05 16:43:01
 * @LastEditTime: 2021-08-05 18:50:14
 * @LastEditors: Please set LastEditors
 * @Description: In User Settings Edit
 * @FilePath: \briup\3-html&css\day04\4-普遍选择器.html
-->
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>普遍选择器</title>
    <style>
       #app>* {
               background-color: turquoise;
        }
        #app {
            height:200px;
        }
        .myDiv {
            color:hotpink;
        }
        #one {
            border:1px solid greenyellow;
        }
     </style>
</head>
<body>
    <div id="app">
        
        <div class="myDiv" id="one">1</div>
        <div class="myDiv" id="two">2</div>
        <div class="myDiv" id="three">
            <div>3</div>
            <div>4</div>
            <div>5</div>
        </div>
    </div>
</body>
</html>